Clarify some. Is the laptop part of the same network as the client/server? If so, how does it connect to your ISP? A different ethernet? If not, then by design, private networks are private and inaccessible from the internet.
Well, the laptop is connected on the same hub, but it dynamically leases an IP from the ISP.
I realize that the private network will not be accessible, but what I wanted to know if there are some IPs I can use for example (224.0.0.x) that can act as a private network but still be accessible by the laptop.
I'm still having trouble picturing the topology of this network. If the laptop is on the same hub but is obtaining an address that is not recognized by the other nodes on the hub, then something is messed up. Is it a smart-hub, or even a router? How does the laptop connect to the internet (broadband router, firewall gateway, DSL, T1)?